The outermost layer of the skin is known as what?

The outermost layer of the skin is known as the stratum corneum. This layer consists of dead keratinized cells that provide a tough, protective barrier against environmental damage, pathogens, and water loss. It plays a crucial role in the skin's overall function by forming a first line of defense, making it essential for maintaining hydration and protecting underlying tissues. The cells in the stratum corneum are continuously shed and replaced, contributing to the skin's ability to adapt and restore itself.

The other layers mentioned, such as the stratum granulosum, stratum lucidum, and stratum basale, are located beneath the stratum corneum and have different functions and characteristics. The stratum granulosum, for instance, contains cells that begin the process of keratinization, while the stratum lucidum is found only in certain areas of thick skin, such as the palms and soles. The stratum basale is the deepest layer of the epidermis and is primarily responsible for producing new skin cells through mitosis.